Should be listed for RPi as the MTU is 64 but not sure how to report
specific Rpi kernel bugs?

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https://bugs.launchpad.net/bugs/1865257

Title:
  Pulseaudio needs kernal conf IMU=size (64)

Status in pulseaudio package in Ubuntu:
  New

Bug description:
  Since Pulseaudio 11.0
  https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/11.0/
  "Improved bluetooth MTU configuration
  The packet size (a.k.a. MTU, "maximum transmission unit") that PulseAudio 
uses with the bluetooth HSP profile was previously always configured to be 48 
bytes. That worked with most hardware, but some adapters require a different 
packet size. Now PulseAudio asks the kernel what packet size should be used, 
which fixes the problem.

  However, a new problem appeared: some adapters that used to work with
  48 byte packet size don't any more work with the size that the kernel
  tells PulseAudio to use. If you find that HSP audio stopped working
  when upgrading to PulseAudio 11.0, you can revert to the old behaviour
  by passing option "autodetect_mtu=no" to module-bluetooth-discover in
  /etc/pulse/default.pa. If that fixes the problem, then please report
  the problem to the BlueZ and/or PulseAudio developers, so that the
  kernel can be fixed.

  Update: We decided to disable the MTU autodetection in 11.1 by
  default, because the feature caused too much problems and it looked
  like the kernel would not really get fixed even when people reported
  issues."

  Presume its a config option in the kernel that differs on each model.
  Pi3/4 should be 64 as they are very much like the 48 byte packages in
  reverse as don't work with the default of 48.

  Its listed as Pulse audio but presume it should be a config setting of
  the kernel for each Pi model.

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